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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdb89f24eeade36427f6c55009df5be59887e3dd30bc5e884d8e21cad66a835' 
  AND token = 'wwYRITC1IvqF7nWoI8TiIGUVTfzgVH8Tl+dpIGJMgao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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