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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d0fe6f18e29a8555dcfd8e23abec31521a09fb3a654e61dc9eebd0f66ba89f' 
  AND token = '2BB5QVZlfF9/4iGFgRiEjxIKMQwvUdIfF5latznE024=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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