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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e15d86d667d2eadc06cbde240451e16c6c67c5e53b96b36160af7a45a30a93' 
  AND token = 'H82n1Z6ffP9HdHbOLZk67qnYoRAOqjY/g7vaTNtFQ6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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