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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3e815ec4f66d1385728256a240fdf66727a2b115fda4638ab701ba5b40d876' 
  AND token = '5u2x30cJflL/NLXX0m1yrTacx1s99dVvv6C3kigR6TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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