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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9ce88afbf74f5664df7ea6f628b37b56bd2bef8cb71ca85590b77d4d7f4747' 
  AND token = '/93ZefuBZgT3Xm5TzfYHs0OKcDbmWM7tfK4pUnslHnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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