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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2be759243f7a563afddba2d1be2d18220b19f01b734e1bfb555c5ca3cabda98' 
  AND token = 'zNpkrpLHP2Q6OqOvYfjzytqRFy1i9FerUcE16J51z84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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