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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94099005caf95e626bc76d26febb012c979e13358b22945ed74494ac685ea02b' 
  AND token = '9godZbK3oZa/N/yHv8/lom158ltqr2+P3ym98UNUd/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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