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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd7e8c33454d2b63c91afc193e562144a3a12c6f82825d5ac6a21ad99fdf875' 
  AND token = 'BKLmrMcNn98gNQPIxEAgFgO3MirEJ/CuJO/mnpxPLjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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