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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae9ecfb52f165862124bf1c2589e4825dac97fe7077b01f29ecf9efc5aca4c1' 
  AND token = '2idTkQQovFAxGtKIY7bMmgQyTa0ocxNHUM+euwWe3tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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