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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e0ff098e7c382f56aaf7e0f5b9385fd08f6310486f5809acf7a5bcf34f9843' 
  AND token = 'PinqzEEgXEBkxQK9xohoOhREhv5Xa3wnmLPuRuDr63M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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