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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0c02c2418fbe6bd80f49091f81d620f10672ae9c6ece3aa3e39fc02072a1b7' 
  AND token = 'u3J6b354+RO0C74USNYKNgxM4d1RzrI0EcMPMD+lo0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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