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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70219570684a34b0bff394d93b8dcea61eccd657372c84de39125139ed6c9132' 
  AND token = '8B9rdQ/FJTggb75/Ee162yNCV9yDFO6JRk+UnaMIlrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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