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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d76e53e96d0f66326c7203a95bce065b75dae1453317b2b324a6a98b9f2880' 
  AND token = '81l7cU9+5CSeDNAWKI3xG4KpU6fD7H/r8/ca3bXHcfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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