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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aafa081686f5bc88c2d70889cf594bc0df3563743acfce51e2919901e5a6172' 
  AND token = 'bxOPj4fD4dCoRaNvor36MLjztMrnN4aJeN3mZiGi3fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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