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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde5a9222481f121634380b3179a753302d5e67876a1a39a990b0a7fdf8730c8' 
  AND token = 'wB9mXC/n8AY6dO0KA0m6hGN6QZcxPbJGtaa8RG70PQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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