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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cceed9112044fed514371eb748810344d33c3b555c86e957a58e4c91a3364a9c' 
  AND token = 'rF9BOxoyYlaStctMSW1C6f76J9Wwam80X+uv9qXVKWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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