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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ceebe4b39855e38d3c7114c699fce7f70ffb1d2a70e3621d186b6a2f367324b' 
  AND token = 'XhLskwfKxSD4wQ2r81ulQocdSwxKh8smXhtMFZ27Xec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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