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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9139bb4a30c91bd387cb7c0846abc4d72af8cc31cc121528375a55f5885881bd' 
  AND token = 'vKDeGGN44gzrnsVmxc2YltKH/mX6TVr0TyRAHn8fYF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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