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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca909f3574f813a586ab4bfe776f2ff640067b87e3ef8c529886d13cea7d94d' 
  AND token = 'MLFBa44jWi7Fmbz1MHn23DEaA7Nb7DjB9pEm+3v4xH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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