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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f76690e1815bac39958113f17be6950bb9fe53f2580717e89476eb8f364963' 
  AND token = '4ukzKu30Qxv+PV+MsGe/rv1N0gcmKIb7VPFly6Jg/fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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