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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606799b77e4e8ce2aed7a7b931e3ccb7f710cdbc8ad56c10c1e970db11dcf3e6' 
  AND token = 'rKY8aX0HO7REYQSzf5hT6JdTp3lLSG132Mb1PtoGXY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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