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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92cfc852d779b0c6b659c73127e6dd347bbe81258d20bbd9367921b5e8ff926' 
  AND token = 'f5A3V4xIJDmawhVmEb+Bi35tBdW4gjGy9wHSgI1THes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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