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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e89beecc3e8b12715ce9e1969931b85279c06f307b409d9bb8dbbc36f2cee3' 
  AND token = 'vQKoLwmcBHHmg8aq9fYofQHJh4W98minBAeuv4VsyfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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