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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da36947b244bdeb2d8c843e10be5a3380de785ab113c7bdd773990be942f05c1' 
  AND token = 'fV8PsM+5rM/ZlCIDRnNOpT4ZlLA8EdAbfDh27Mp60O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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