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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119b178f1a4d0619c74f2e104b19922dd224d45364ea59c716abfd7c357bebae' 
  AND token = 'GMCz2EYY2Ptdiz0zZj/MXqLoyXnQu/Vd/QOWnNJ2DT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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