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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a64e6d0aed28ed0be89a051aab8094246bf553c81fe1081c7d37155172ee954' 
  AND token = 'UA8W2eH/WPWQesz6mWLy9TTU0JCt07OdBu2H350G/L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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