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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a4afde5b529f1be6d4def8c8ba68f931723b30f21a94486933152364a2f3e2' 
  AND token = '7oaaCcc6XMG+pIL7Elzf/RiV+zYtlkoqNmGkrML5ul4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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