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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fab29a205e249afe5caaa12e3fcaf58df4943c3e09eacd8913c64eef39b4bff' 
  AND token = 'oqfE9yEV9fxkb1kzTWKpmC5A76CAzEEF8IigMlp752Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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