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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d54ba22567cdb9d90002aa442535d457149101569a7a2a24100334c03dcdd6' 
  AND token = 'zVmJcVtaViVBTitud19Zq1/Jpp3n6P5rhZrd05W3u/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}