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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0537f6d4bb723f196ea475fad49fe7a47c5bf87d3be5bcae66aaa9c999f1ef5b' 
  AND token = 'WbX8YO87VUWJj4Nk1UbNqVJbE7zcElennM9we2M2FUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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