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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0616d3bef4bfebd5487d9184296bb10713d9e39296b9c7798151542053f39bf8' 
  AND token = 'rRF6HHTMGQ1++R4hXqOVaGERd7jtKa/7TePblCWAP0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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