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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7370e5ee27ad5ba41016fd9e958876376c7e2dd44b0e0e8a953c331046fd3b6' 
  AND token = 'DX7/nUy8KCSHrAtbft/SiPE1MuGCOst4MFViKzGCTUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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