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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19133bf9db3ea864acfbdd5a8aa5a1bb5c7fe78eccfec3f4921b61ddffd054a6' 
  AND token = 'Ss2j8IVn4droITN6qXYQ8Dgu1LxueRCmX1a3F5puI8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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