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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4844011f2d208b59e2379c0941b4dc37ada072ca4f2b040d00329531988bf44' 
  AND token = 'OnWwWVO5tQk0UG22ejkqbiOhnkzKzo+IPqJd2hQmYlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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