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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8f5ece1eff0e83e350b19560d5293fc0e465a93a5e06ef7d2d01ac956ba6da' 
  AND token = 'tyR7neJdUV17FP7C2cNyGp1unfU51/Jvoqhx9xOZ1b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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