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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cfa9f326eb5c8aa3f6ba6db71897420edbebb4f32a512cd75eb9d74d7bdacba' 
  AND token = 'qohE9DwDUFKv08Oi+c0M4ydMh9JpMRSE2IzbwcA7T28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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