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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d3819fb3b76691b0f8ae314d20ddad0aac5184dcbee921a71765451da6d920' 
  AND token = 'g1codiI7UzudC5U97yqdjAhUgsPo78Ka8KM9kUIA9uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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