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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9c791d1f76f56b70373bfac923f1e81376a661dcc2403df6076e094aad6033' 
  AND token = 'JP/3t6em+6q50V+bmFVhkHtb3LnwaOHpI9vl5DTiO+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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