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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79aba71e9f77c64dbfa2b268ab17d2355e76d8405b155d6aade3fb59bd6183b' 
  AND token = '/s8QsyV9gXpAU1ZaOJq2Xd1GysUQTIeUf8b0ITmWCZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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