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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b15c4339dbfb6170791cd97d5a86a21a688f110c084ddea61e7fea0c19d9cca' 
  AND token = 'hVSgRtr2BghwlEtTRgEH0q0Ine33Z/GwWvaIBwfBg0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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