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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b744c4ee7b474c8e4fe59ffce15982f1966162acf75da3485139e0ec7f3ae1' 
  AND token = 'DkO/yFAfZJ4LSqNa5Bljg50l5R3BxEOuU5cWOcqD9Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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