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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f451b7b558d094becc9869dbccadeffdedc8662fb05da6d338e7c2003858fc' 
  AND token = 'LM6Wa1Fy6v3LG6SOpIqhUOxvs+e92YO88zj+yUhO7MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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