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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1194010f35247fa0c83d8fb93778f9ed802e07712a3a236ded3980ed59d3982' 
  AND token = 'NZWbRLogKh5K2V8AkDqkIuOGQZ/ka+gegEcfPuMYKNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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