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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf35d687dbe15c4c09f160c233fe2ae6697361b7be8e101ded4209a7d476a24' 
  AND token = '3z9dltnVjb/XGhJCggL6QolD0Cm83z1D1yt3yCGVdYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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