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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2079ba8839a7e684fceeaa31d203d3f7dca7e64a428c14de032917a7e11c7d7' 
  AND token = 'RvP8Z/zcuL6mfC5qa8aGi5lj3cTL0Xlkr6/Uiex9i2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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