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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1ab3141ea6d163d30109585d6e4ceefa6e465e93adc62ff1d7a61a2c511a8c' 
  AND token = 'aQHQd6hf5rB47I6Hd5WwGWUQ3+/7wEiH8F1VvEWCLPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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