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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f68dfdcad8ecca7441d76b074eeba2ae4d2c3c962a7d061aaa1cf2ded115ac' 
  AND token = 'Nah+XLkZtFn0j9GxL7tGguPuo+lw02Nyh3UGpAA23v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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