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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff59ff13b81903c2817fa5f29c08738917baca3eea4896eb2d99a93d58089d79' 
  AND token = 'iS1Q/h8MCqU/gC1bd1hBWZuKKXXbge0W5FItP/LSbls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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