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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8af9c121940a5116cc2e815c036575bbe476d65a0ee86b50a66a8d620bd0add' 
  AND token = 'g4ZmCu5upNOhk4eNeOwa19ZvYuiCmq2yruStOgDOI74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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