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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84f9bf7e6b07b13a7b40a055e4afa1f4d70abd153fe3b263b5e1d760962ceae' 
  AND token = 'cw0VwITVcCuEmbcxhRzNaCYvzsm+Y+ut6uzBT/tJg2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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