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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab52c9dc62344e11c166d0c7104be0ac67e409808e05f3c72d84746b438f0f5' 
  AND token = 'bCl60RqLVnPD04N/mRSjhF5qerX2qb0fc7aaOj47ZO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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