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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49218fe284e7b9906e42d7d989c52869db78fa96b5400a1c15de586e24c357f5' 
  AND token = 'CDe9MRqVypcW0sRuSznF5cIkVKjM0DV5qdR8qZEil8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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