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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc82719cbc3b03365bb6e04777c699beab50b1bc393c678abb9d932b386d044' 
  AND token = 'InSYIN1DDaa7+M/yaRt5AGmnN/DvgQO0+o0T+i8rVzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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