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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bc93e36dd382245379667aed9afcfe539df0ad424aa6e65f6060bba7a4586d' 
  AND token = '7fr60Rxwav3BomOlROPp9qhe2NGdZ2gVIVlrpMe8N7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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