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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e490a9f6a1bac790897061d17b68dc74645df542daffa779bd22127a00fff1c8' 
  AND token = '8k5PeY1wUFUpDdO8cs6ceEiV0r45FhXNGJTA0tZpjS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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