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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19af67e0e23a7d46de244d581e3f44cafa643f74c8d502bfa420a37a039d73f9' 
  AND token = '9DFVFszoT222/P98P4x78eMlJfWEH6kT+3/pv++Nzr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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