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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b40ce8a0f70b96def3bde9f401f065403e5e3a356f1d2705ffee1cfd3e347d' 
  AND token = '4QzyCFeb51EhvzE05MOcbnZFh8cIkVsjnVd//a6JGcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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