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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15968bf54e3821d5c072b4b81815727cf43a4d19576e0a47bfaa33c8e9660cb' 
  AND token = '2WjF4Sf1NL9r3UFu7m7mx2+knxaQyKgqEJVyO+EhLpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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