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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4593e7dc8d6a7785f78654d65e2ff580569debef59e6d7029fc9c18d83f9f9e' 
  AND token = 'OsX662igtseHWMS5JNCho9gfr6tTrjrOJuZOLioODKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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