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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949591dda5c267664a2ac3e582503d01150f893bd27a7ed916fdfb7757b93842' 
  AND token = 'DWGWyhURo5Geq08mWt8tY4PFKC7/REBaEHh9WZVMRf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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