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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bbcf5c625b1e03b05c0fba63824672e116e05a0e9e09e6edb3f7566e2108bf' 
  AND token = 'pKD1eUQu+U9Ldc9bERlmNQVX72R5T5crnNEAZxOCc8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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