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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076134169749ea77e92aa48913048f10af99d34424e987b77bbd815242a8a25b' 
  AND token = 'hED9EozJ9RldvYGTdsvCMzqNOBzy+tTwKUSYx7D9csc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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