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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d3be4b0f26ca3c6989cb1333dc6b54f4a6a91611ea4e3547b99e19425072d6' 
  AND token = 'dERWRC9x5RISznieBJ0nCRodWUE6hCh7CTx98w0zulk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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